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5.0 - Sluggish & Pinging Under Load..What Should I Check?

Thallarsen

Well-Known Member
Joined
February 21, 2000
Messages
126
Reaction score
7
City, State
Potomac, Maryland
Year, Model & Trim Level
'99 5.0 Limited AWD
Although I’ve got a good idle, and a smooth running engine, my ‘99 Limited is sluggish going up hills at highway speed, and I’m noticing an increase in pinging under light loads at speeds above 45/50 mph.
My mileage isn’t too bad, and I’m using major brand regular gas. I’m not getting bucking or rough running under heavy acceleration....something that fuel starvation would cause - just lack of power at highway speeds & pinging under load.
New Autolite plugs, Taylor Spiro wires, new fuel filter, MAF is clean, and the air filter isn’t too bad.
I’m not hearing a vacuum leak, but I can’t figure out what else to check.
Seems like either vacuum, or a timing advance issue.
What should I check?
 



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Lemondrop

Well-Known Member
Joined
August 28, 2001
Messages
245
Reaction score
1
City, State
Cocoa , Florida
Year, Model & Trim Level
1995 Sport , 1996 XLT 5.0
How many miles your injectors have ?
My 96 is pinging when I stomp the pedal down pretty bad . It's on my to-do list .
The engine has 158,000 on it so I figure my injectors are giving it up a little . I did notice a whine coming from the engine compartment . Dunno if I got a vacuum leak , belt noise , or tranny making noise . Works fine other than ping at upper rpm's or full throttle romps .
 






Thallarsen

Well-Known Member
Joined
February 21, 2000
Messages
126
Reaction score
7
City, State
Potomac, Maryland
Year, Model & Trim Level
'99 5.0 Limited AWD
128k on the truck. Mostly highway miles. I've taken out the MAF again, and thoroughly cleaned it; and will reset the PCM and see what it gets me.
The jury's still out on whether Sea Foam works; at least from what I can gather. I'm reading some posts praising it, and some saying to stay away from it.
What puzzles me, is that my mileage has been really good for an AWD V8 SUV. Consistent 18 to 19 mpg (75% highway.) Now it's more like 17, but that's still pretty good. It's just so sluggish going up inclines at high speed.
My 250k '91 had more higher acceleration punch, but the mileage was never as good......go figure.
 






james t

Elite Explorer
Moderator Emeritus
Joined
January 27, 2002
Messages
10,666
Reaction score
9
City, State
Texarkana AR/TX
Year, Model & Trim Level
94 SAS sport
sounds like carbon knock. Seafoam (or water) will do the trick. just make sure its done correctly, or you could hydrolock the motor.
 






TheJMan

Well-Known Member
Joined
April 5, 2003
Messages
545
Reaction score
0
City, State
Scottsdale, AZ
Year, Model & Trim Level
2009 Mazda 3 Hatchback
Try using some kind of fuel system cleaner. Some people swear by Techron, but I used Valvoline complete fuel system cleaner and it really helped smooth out the engine. I haven't had too many problems with pinging, but my MPG went up slightly after using the Valvoline. I highly recommend it.
 






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